39471891 has 8 divisors (see below), whose sum is σ = 52712400. Its totient is φ = 26272992.

The previous prime is 39471881. The next prime is 39471899. The reversal of 39471891 is 19817493.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39471891 - 2¹⁹ = 38947603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39471899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8116 + ... + 12033.

It is an arithmetic number, because the mean of its divisors is an integer number (6589050).

Almost surely, 2^39471891 is an apocalyptic number.

39471891 is a deficient number, since it is larger than the sum of its proper divisors (13240509).

39471891 is a wasteful number, since it uses less digits than its factorization.

39471891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20805.

The product of its digits is 54432, while the sum is 42.

The square root of 39471891 is about 6282.6659150396. The cubic root of 39471891 is about 340.4834270797.

The spelling of 39471891 in words is "thirty-nine million, four hundred seventy-one thousand, eight hundred ninety-one".